Think the best thing you could do is actually do a recee of the route.

If this is not possible then search for the route on MapmyRun and see if this fits in with your level of training. This should give you an idea of whether you are on target or not with where you want to finish.

If it's the clockwise route then very roughly it's about 1/3 across fields and trails and is flat, then the next third is the ascents and descents and then the last 1/3 is the home run back across fields and roads.